Self-mapping the longitudinal field structure of a nonlinear plasma accelerator cavity

C. E. Clayton (), E. Adli, J. Allen, W. An, C. I. Clarke, S. Corde, J. Frederico, S. Gessner, S. Z. Green, M. J. Hogan, C. Joshi, M. Litos, W. Lu, K. A. Marsh, W. B. Mori, N. Vafaei-Najafabadi, X. Xu and V. Yakimenko
Additional contact information
C. E. Clayton: University of California Los Angeles
E. Adli: SLAC National Accelerator Laboratory, Menlo Park
J. Allen: SLAC National Accelerator Laboratory, Menlo Park
W. An: University of California Los Angeles
C. I. Clarke: SLAC National Accelerator Laboratory, Menlo Park
S. Corde: SLAC National Accelerator Laboratory, Menlo Park
J. Frederico: SLAC National Accelerator Laboratory, Menlo Park
S. Gessner: SLAC National Accelerator Laboratory, Menlo Park
S. Z. Green: SLAC National Accelerator Laboratory, Menlo Park
M. J. Hogan: SLAC National Accelerator Laboratory, Menlo Park
C. Joshi: University of California Los Angeles
M. Litos: SLAC National Accelerator Laboratory, Menlo Park
W. Lu: Tsinghua University
K. A. Marsh: University of California Los Angeles
W. B. Mori: University of California Los Angeles
N. Vafaei-Najafabadi: University of California Los Angeles
X. Xu: University of California Los Angeles
V. Yakimenko: SLAC National Accelerator Laboratory, Menlo Park

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract The preservation of emittance of the accelerating beam is the next challenge for plasma-based accelerators envisioned for future light sources and colliders. The field structure of a highly nonlinear plasma wake is potentially suitable for this purpose but has not been yet measured. Here we show that the longitudinal variation of the fields in a nonlinear plasma wakefield accelerator cavity produced by a relativistic electron bunch can be mapped using the bunch itself as a probe. We find that, for much of the cavity that is devoid of plasma electrons, the transverse force is constant longitudinally to within ±3% (r.m.s.). Moreover, comparison of experimental data and simulations has resulted in mapping of the longitudinal electric field of the unloaded wake up to 83 GV m−1 to a similar degree of accuracy. These results bode well for high-gradient, high-efficiency acceleration of electron bunches while preserving their emittance in such a cavity.

Date: 2016
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DOI: 10.1038/ncomms12483

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